This is yet another approach to refresh modules in %INC during the development cycle, without the need to have a forking process to watch for filesystem updates. This middleware, in a request time, compares the last refresh time and the current time and if the difference is bigger than cooldown seconds which defaults to 10, call Module::Refresh to reload all Perl modules in %INC if the files have been modified.

Note that this only reloads modules and not other files such as templates.

This middleware is quite similar to what Rack::Reoader does. If you have issues with this reloading technique, for instance when you have in-file templates that needs to be recompiled, or Moose classes that has make_immutable, take a look at plackup's default -r option or Plack::Loader::Shotgun instead.